Secondary angle closure can be divided mechanistically into types with pupillary block and those without pupillary block. Non–pupillary block secondary angle closure can be further categorized as being caused by either “pushing” or “pulling” mechanisms (or possibly both), that is, those that push the iris forward from behind or those that pull the iris forward into contact with the trabecular meshwork. Table 10-1 shows the classification of secondary non–pupillary block angle closure according to pushing or pulling mechanisms.
Excerpted from BCSC 2020-2021 series: Section 10 - Glaucoma. For more information and to purchase the entire series, please visit https://www.aao.org/bcsc.